[SI-LIST] Re: Crystal osciiator not oscillating

From: "Andrew Ingraham" <a.ingraham@xxxxxxxx>
To: "si-list" <si-list@xxxxxxxxxxxxx>
Date: Wed, 23 May 2007 15:06:11 -0400

> 2)       By keeping the load capacitance value same as 15pF,  a 100K
> externalresistor between the XTAL &EXTAL pin of the microcontroller,
> population starts oscillations.

I don't know much about xtal oscillators, but I'm wondering if there might
be a DC bias problem with the circuit.  With the circuit not oscillating, is
the input (one of the pins) biased so that the inverters are in their linear
(amplifying) region?  Perhaps the 100K resistor is needed to help make that
happen.

Andy

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field


List technical documents are available at:
                http://www.si-list.net

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

References:

[SI-LIST] Crystal osciiator not oscillating
From: Narayane Manish Shivdas, TLS,Chennai

[SI-LIST] Re: Crystal osciiator not oscillating

Other related posts: